Conical crushing mill



Nov. 2 1926. 1,605,007

c. F. SMITH ET AL CONICAL CRUSHING MILL Filed Nov. 19. 1923 12 FIG.1

AT'7LOPNEY Patented Nov. 2, 1926 UNITED STATES PATENT OF FICE.

CHARLES E. SMITH. AND HARVEY H. RUMPEL, OF HILWAUKEE, WISCONSIN, A8-

SIGNORS T SMITH. ENGINEERING WORKS, OF MILWAUKEE, WISCONSIN, A COR PORATION OF WISOONSIN.

CONIGAL CRUSHING MILL.

Application filed November 1'8, 1923. Serial No. 675,572.

- terial travels between a conical concave and a conical crusher head disposed with their axes approximately horizontal but con structed and arranged so that their crushing surfaces convergetoward the outlet, whereb the material traveling with the concave wi be repeatedly brought between the crushing surfaces and progressively pinched as it advancesjthrough the crushing zone so as to produce gradual reduction.

Another object of the invention is to locate the crushing zone to one side of the vertical plane through the axis of the conical concave, thus facilitating the return. of the ma-- terial to the crushing side of the crusher head and insuring a greater number of crushin operations thereon and minimizing the tendency for material to pile up on'the other side of the crusher head and work lts way out of the concave in its uncrushed state.

Another object of the invention is to provide a scraper for removing material 'caked on the walls of the concave and locatedin a. position to cause such material to fallen the crushing side of the crusher head.

WVith the above and other objects in view the invention consists in the conical crushing mill as herein claimed and all equivalents.

Referring to the accompanying drawings in which like characters of reference indicate the same parts in different views,

Fig. 1 is a longitudinal sectional view of a conical crushingmill constructed in accordance with this invention on the inclined plane of line 11 of Fig. 2;

gig. 2 is an end View of such machine, an

Fig. 3 is a similar View with parts sectioned on the plane of line 33 of Fig. 1.

In this drawing 10 indicates an approximately horizontal tubular shaft journaled in bearings 11 with a driving gear 12 fixed thereon between the bearings and meshin with a pinion 13 on a driving shaft 14; which is driven by any suitable power as by means of a belt on a pulley 15. At one end a spout 16 delivers raw material into the interior of the shaft, where it is acted upon by a spiral worm or internal flange 17 to advance it through the shaft to the other end, on which a flaring crushing concave 18 is rigidly clamped, as by bolts 19. A conical crushing head 20 in the concave is mounted on an arm 21 -that is pivotally supported by trunnions 22 thereon working in bearing blocks 23 on the same base 24 as the bearings 11. This crusher head 20, while having no driving connection, is free to rotate on the arm 21 as it is impelled by its contact with the concave 18 or the material pinched between them.

The arm 21 is held with pressure in the position in which the crusher head 20 contacts with the concave or at a desired distance therefrom by means of coil springs 25 confined between spring seat members 26 on said arm and the base 24 respectively, the former being preferably pivotally mounted on the arm, while the latter is adjust-ably mounted on the base by fitting on the end of an j ble set-screw 27. The position of the crusher head may be adjustably determined by means of a tie-bolt 28 connecting the arm with the base and incidentally passing through the spring seat members, the set nuts 29 on such tie-bolt serving to adjust the position to which the crusher head is moved by means of the springs. The combined influence of the springs and the tie-bolt determines the position of the crusher head but permits it to yield upwardly when necessary.

Instead of the concave or crushing ring 18 and the crusher head or conical roll 20 being arranged with their axes in the same vertical plane, it is found desirable to locate them in an inclined plane, as shown, whereby the crushing zone formed between those portions of their crushing surfaces which nearest approach each other is well up on the ascending portion of the crushing members. It is also found desirable to form the crushing faces of the members so that the crushing zone between them converges toward the outlet.

In order to avoid obstruction to the progg ress of the material through the machine and prevent the accumulation of a cake of pul- "erized material adhering to the Walls of the ring, a scraper 30 is provided, which is preferably mounted on a stationary part of the machine and extends into the ring close to the wall thereofand in position to cause the material scraped from the rin to fall on the crushing side of the crusher cad or roller.

In operation the material fed through the verging toward the outlet.

shaft 10 falls into the crushing zone between the conical concave and conical crusher head or roller, where it is pinched and carried around with the crushing members to the crushing side of the roller to be pinched again and this action is repeated while the material progresses toward the outlet, since the active faces of the crushing members converge. It will be seen that because of the crushing zone being located some distance above the bottom of the roller, the distance it has to be lifted in order to travel over the roller is reduced and the capacity of the trough formed between the roller and the ring is diminished, both making for greater facility in the travel of the material over the roller and against an accumulation thereof on the non-crushing side of the roller, which might permit large pieces to pass through the machine uncrushed. This side location of the roller increases the capacity of the feed trough on'the crushing side of the roller, while reducing the capacity of the trough on the other side of the roller, which further increases the capacity of the machine besides making for a greater number of reduction pinches in the travel of the material through the machine. In this manner the materlal is repeatedly pinched between the crushing faces as it advances and the reduc= tion is gradual and the strain and wear on the machine is much less than where the entire reduction is required to be accomplished at once.

The scraper, by cleaning the compressed pulverized cake from the walls of the ring as fast as it is formed and depositing it in the trough on the crushing side of the roll, prevents the machine from clogging and choking and promptly returns to the crushing zone in an advanced position where the crushing surfaces are closer together the uncrushed particles of material that maybe embedded in the cake and-prevents the roller being forced upwardly out of its adjusted position by the compacted cake, which might occur in the absence of the scraper.

What we claim as new and desire to secure by Letters Patent is:

1. A conical crushing mill comprising a rotatably mounted approximately horizontal tubular shaft through which material may be fed, a flaring conical concave carried at the end of said shaft forreceiving material therefrom, and a conical crusher head within the concave forming a crushing zone therewith, with the crushing faces con- 2. A conical crushing mill comprising an a proximately horizontal rotatable tubular sl faft, a spiral flange therein for feeding material therethrough, a flaring concave on the end of the shaft receiving the material therefrom, and a conical crusher head within the concave and forming therewith. a crushing zone with faces converging toward the out- 5. In a crushing mill, a suitably mounted and driven rotatable flaring concave to which material is fed, and a conical crusher head within the concave with its crushing face set apart from the crushing face of the concave at the feed end but converging therewith toward the discharge end to produce a gradual comminution of the material as it flows toward the discharge end and while it is carried around with the concave to 'pass repeatedly between the crushing faces.

6.'A conical crushing mill comprising an outer roll with actuating means and havin an interior'crushing surface smaller at the feed end than at the discharge end, an inner roll likewise smaller at the feed end than at thedischarge end and havin a rolling contact. within the outer roll, 1; e spacing between the two rolls being greater at'the feed end than at the discharge end and the inner roll being free to rotate but not driven .except by friction with the outer roll and with the material between them. 7

7 A conical crushing mill comprising a rotatable flaring concave, and an independently mounted conical crusher head therein forcibly but yieldingly held in a predetermined spaced relation with the walls of the concave and forming therewith a crushing. zone with its faces converging toward the outlet. 1

8. A conical crushing mill comprisin a rotatable flaring'coneave, a conical crus er head therein forming with the walls of the concave a crushing zone with its faces converging toward the outlet, and means for forcibly but yieldingly supporting the conical crusher head in a predetermined spaced relation with the concave.

9. A. conical crushing mill comprising a rotatably mounted conical concave with an approximately horizontal axis, and {conical crusher head within the concave positioned to one side of the vertical plane through the axis of the concave. j

10. A conical crushing mill comprising a rotatably mounted conical concave with an approximately horizontal axis, and a con- J 7 icalcrusher head within the concave with its axis at onesideof the vertical plane of the axis of the concave and formingtherewith a crushing ,zone' with its faces converging toward the outlet.

11. A conical crushing. mill comprising a suitably mounted rotatable flaring concave and an independently mounted conicalcrusher head yieldin'gl supported within the concai e at the ascen ing portion thereof. 12. A conical crushing mi 1 comprising a rotatable flaring concave and an independcending part of the concave.

13. A conical crushing mill comprising a rotatable flaring. concave, an independently mounted conical crusher head within the. concave and forming therewith a crushing zone with faces converging toward the outlet, and a scraper for scraping the walls of the concave above the descending portion of the crusher head to cause the material to fall on the crushing side of the crusher head.

14. A crushing mill comprising a rotatable flaring concave, a conical crusher head yieldingly' supported'within the concave at the ascending portion thereof and forming therewith a crushing zone with faces con-v verging toward the outlet, and a scraper for scraping the walls of the concave above the descending portion of the crusher head.

In testimony whereof we aflix our signatu res.

CHARLES F. SMITH. HARVEY H, RUMPEL, 

